fix: diff coomparison is slow for large testcases

Author: jatinkatyal13

Dockerfile

@@ -1,7 +1,7 @@
 FROM node:8-alpine
 
 RUN apk add --no-cache docker
-RUN apk add build-base
+RUN apk add build-base diffutils
 
 WORKDIR /usr/src/judge-taskmaster
 

src/tasks/scenarios/submission.ts

@@ -66,7 +66,7 @@ class SubmissionScenario extends Scenario {
       const expectedOutputFile = path.join(currentTestcasePath, 'stdout')
 
       const diff = exec(`
-        diff -b -B -a -q ${runOutputFile} ${expectedOutputFile}
+        diff -b -B -a --suppress-common-lines --speed-large-files ${runOutputFile} ${expectedOutputFile}
       `)
       const score = diff.code === 0 ? 100 : 0